That story is creepy but really nice at the same time. You have to wonder if your uncle was just on your mind or if there was something more going on to make you dream that. I remember being in the room when my own uncle died and my mom crying as he passed. As I drove her home 10 minutes after we left the hospital the rain that was pouring stopped and the sun came out and a rainbow appeared in front of the car. Maybe my uncle played a role in that rainbow to say it's okay. Or it was just a coincidence. You never know. At least events like these help us process grief by finding meaning in them.
I just go with the flow... and try not to ask too many questions. When you're travelling though, it's always best to pay attention to the signs.